The "first responder" of muscle repair — elegant splice-variant biology, almost entirely preclinical. Three points define this entry: (1) it's a genuinely distinct piece of biology — an IGF-1 splice variant whose unique E-peptide activates muscle stem (satellite) cells, a different job from ordinary
MGF (Mechano Growth Factor, IGF-1Ec) is a splice variant of IGF-1 produced locally in muscle in response to mechanical stress or damage. Its distinctive part is a 24-amino-acid E-peptide that acts as an early "first responder" repair signal — it wakes up quiescent satellite cells (muscle stem cells) and makes them proliferate, a job the ordinary circulating IGF-1 doesn't do well. In the natural repair cascade, this MGF pulse comes first (within hours), expanding the stem-cell pool, and is followed by a switch to IGF-1Ea, which drives the actual fiber growth. The biology is elegant and real — but it's overwhelmingly preclinical. Native MGF has an extremely short half-life (~5-7 minutes) by design (it's meant to be a local, transient signal), which is why the gray market sells PEG-MGF (PEGylated, longer-acting) — a form that carries batch-to-batch inconsistency and still lacks meaningful human trials. Add no long-term safety data on artificially activating muscle stem cells, and the honest read is: interesting mechanism, minimal human proof.
not approved anywhere; investigational research peptide. Not a cosmetic; no compounding pathway.
An honest grade per outcome — drawn from the evidence, not any catalogue. Hype and undemonstrated marketing claims grade low.
A credentialed reviewer (PharmD / PhD / MD) will be named before this entry is finalised. Until then, treat it as a working draft. Last updated July 2026 (watch for any controlled human data — the field is preclinical-heavy; that would move the grades).
Grades reflect the published evidence, not our interest. No dosing, reconstitution, or administration is published for research compounds — that restraint is deliberate.
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